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Showing results for tags 'alston formation'.
Found 4 results
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A very common genus, ranging from Ordovician to Upper Carboniferous to ?Permian. This specimen shows good internal detail of the narrow corallites (1.2 - 1.5 mm), including septal spines which are not diagnostic and may not always be present (this may be preservational). The long, infundibuliform (funnel shaped) tabulae are characteristic and show in some of the longitudinal sections. Scale bar 1 cm long.
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Partly preserved in what I think is ferroan dolomite, with clear calcite in the voids which allows a 3D view of the structure in places. A common cerioid coral at this level, with a wide range of preservations. Formerly Lonsdaleia which is now restricted to branching versions.
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- actinocyathus
- alston formation
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Characteristic of the Upper Visean and Lower Namurian of Europe and Africa. Easily identified by its compact, cuspidate axial column made of small tabellae. One of the less common solitary corals in the Great Limestone, this one is in a dark matrix locally known as "Frosterley Marble".
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A small colony surrounded by Archaeocidaris debris. It shows the obverse side , i.e. the side with pores. It is preserved on the top face of a thin limestone lens that was overlain by shale. This is the most common fenestrate bryozoan in this area but the majority of specimens are found in shale and rarely split to show the obverse as it is the "stickier" side due to the pores.
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- alston formation
- brigantian
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